Identical pion intensity interferometry in central Au plus Au collisions at 1.23A GeV HADES Collaboration

J. Adamczewski-Musch,O. Arnold,C. Behnke,A. Belounnas,A. Belyaev,J. C. Berger-Chen,J. Biernat,A. Blanco,C. Blume,M. Boehmer, R. Bordalo,S. Chernenko,L. Chlad,C. Deveaux,J. Dreyer,A. Dybczak,E. Epple,L. Fabbietti,O. Fateev,P. Filip,P. Fonte,C. Franco,J. Friese,I Froehlich,T. Galatyuk,J. A. Garzon,R. Gernhaeuser,M. Golubeva,R. Greifenhagen,F. Guber,M. Gumberidze,S. Harabasz,T. Heinz,T. Hennino,S. Hlavac,C. Hoehne,R. Holzmann,A. Ierusalimov,A. Ivashkin,B. Kaempfer,T. Karavicheva,B. Kardan,I Koenig,B. W. Kolb,G. Korcyl,G. Kornakov,R. Kotte,A. Kugler,T. Kunz,A. Kurepin,A. Kurilkin,P. Kurilkin,V Ladygin,R. Lalik,K. Lapidus,A. Lebedev,L. Lopes,M. Lorenz,T. Mahmoud,L. Maier,A. Mangiarotti,J. Markert,T. Matulewicz,S. Maurus,V Metag,J. Michel,D. M. Mihaylov,S. Morozov,C. Muentz,R. Muenzer,L. Naumann,K. Nowakowski,M. Palka,Y. Parpottas,V Pechenov,O. Pechenova,O. Petukhov,K. Piasecki,J. Pietraszko,W. Przygoda,S. Ramos,B. Ramstein,A. Reshetin,P. Rodriguez-Ramos,P. Rosier,A. Rost,A. Sadovsky,P. Salabura,T. Scheib,H. Schuldes,E. Schwab,F. Scozzi,F. Seck,P. Sellheim,I Selyuzhenkov,J. Siebenson,L. Silva,Yu G. Sobolev,S. Spataro,S. Spies,H. Stroebele,J. Stroth,P. Strzempek,C. Sturm,O. Svoboda,M. Szala,P. Tlusty,M. Traxler,H. Tsertos,E. Usenko,V Wagner,C. Wendisch,M. G. Wiebusch,J. Wirth,D. Wojcik,Y. Zanevsky,P. Zumbruch

PHYSICS LETTERS B（2019）

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摘要

We investigate identical pion HBT intensity interferometry in central Au +Au collisions at 1.23A GeV. High-statistics pi(-)pi(-) and pi(+)pi(+) data are measured with HADES at SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta in the longitudinally comoving system and parametrized as three-dimensional Gaussian distribution, are studied as function of transverse momentum. A substantial charge-sign difference of the source radii is found, particularly pronounced at low transverse momentum. The extracted source parameters agree well with a smooth extrapolation of the center-of-mass energy dependence established at higher energies, extending the corresponding excitation functions down towards a very low energy. (C) 2019 The Author(s). Published by Elsevier B.V.

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